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A. I. GRIGGS.

.STOVE BOARD.

(No Model.)

No. 279,240. Patented June 12,1883.

By his viiiOlllcZ/s,

WITNESSES:

f FPATENTL OFFICE.

A f*irtvineiueesjor wnsrronn, imw re STOVE-BOARD.

SPECIFICATION forming part of Letters Patent No. 279,240, da.ted June 12, 1883.

Application filed April 11, 1883. (No model.) i

' ford, in the county of Otsego and State of New York, have invented certain Improvements in Stove-Boards,of whi ch the following is a specification. H

v My invention relates to that class of stoveboards in which a sheet-metal face is backed by a filling or body of wood or other material commonly employed for this purpose. Such boards havebeen made by covering the wooden backing or body with a sheet of zinc, the edge of which is then spun down over a beveled or molded edge'of the wood and under its bottom. This is easily done, as the zinc takes shape readily in spinning; but owing to its soft and yielding character the surface upon which the stove stands soon becomes indented and marred. To obviate this, tin-plate has been employed to some extent; but itis'found to be impossible to spin this harder and more refractory material over the edge of the wooden backing. Resort has been had, however, to crimping the tin sheets in order to cause them to take over the edge of the wood properly, and in some cases the sheet has been applied in quarters or sectors and seamed together.

' It is desirable, however, that the upper surface of the board shall be smooth and level, or at least devoid of seams and corrugations; that it shall be made from one sheet; that it shall be of some harder and more unyielding material than zinc, and that the part of the metal covering which binds the edge of the backing shall be of some metal that may be spun smoothly over the molded or finished edge of the backing. This I accomplish by making the coveringplate of sheettin, either plain, crystallized, or embossed, as desired, and of the same shape as the wooden or other backing. To the mar- "gin of this tin sheet or disk I attach, by seaming, a strip of sheet-zinc wide enough to be spun over and to cover the edge of the back- Boards have been proposed in which the metallic face or top plate has been made sepa- I rate from the binding, and the binding;strip bent over around the edge of the backing and usual way with sheet metals.

construction is that the binding-strip is readily forced off and detached. By seaming the two together I obviate this.

In the drawings which serve to illustrate my invention, Figure 11's a cross-section of a stoveboard embodying my invention in its most approved form. Figs. 2 and 3 are views illustrating steps in the construction. Fig. 4 is a detached fragmentary view, showing the mode of securing the ends of the binding-strips. Figs. 5, 6, and 7 show various ways of arranging the seam.

A represents the wooden or other base or backing for the board; B, the tin disk or plate which covers the top of A, and O is the zinc binding-strip.

In constructing my-board I may employ a straight strip of zinc of the proper width, or an endless washer-like strip. I will describe the operation where a plain straight strip is employed. I cut a sheet of tin-plate of the proper thickness to the shape of the wooden backing, which is usually circular, and then turn down its edge preparatory to seaming, and with the usual mechanism. I then take a strip of zinc of the proper length and secure it to the edge of the tin disk by seaming in the Fig. 2 shows the first step in the seaming process; but in the after process the strip 0 is turned down. After the zinc strip is united to the tin, so as to form a border for the latter, the whole is placed upon the backing A, and the zinc border spun down wit-h the usual tools until it assumes the form and position shown in Fig. 1. The ends of the strip C may then be soldered together or secured to the wood by a tack, as in Fig. 4.

Fig. 3 shows the zinc strip cut from a sheet in an annular washer-like form, and its inner margin seamed to the tin. The dotted lines show how it is bent downward in spinning.

I have spoken of the zinc strip 0 as being a straight strip or an endless annular strip; but

it may be a strip with curved parallel edges, but not endlessthat is to say, it may be part of an endless annular strip of which the radius of curvature greatly exceeds the radius of the circular plate B. Then this form of strip is,

adopted it will, after seaming, stand off or down at an incline, the angle with the plate B depending upon the radius of the curvature.

In Figs. 5, 6, and 7 I have shown the seam arranged in different ways. Fig. 5 shows it formed back from the edge of the wooden backing. Fig. 6 shows the zinc thrown up to a level with the surface of the tin-plate. Fig. 7 shows the seam turned in the opposite way from that in the other figures. This forms a slightly-raised border around the board. I prefer to turn the same in the opposite way, as it offers less obstruction to the movement of the stove.

I have shown a plain single seam; but I may employ the ordinary double seam as well. I

" have also referred to the plate B as made from one piece, and I prefer to make it from one piece, but it may be made from several pieces seamed smoothly together, with the seams turned down.

Fig. 1 shows my improved mode of attaching the central button or ornamental boss to the board. The button a may be of the usual. kind. These are ordinarily attached by soldering to the under sideof the 'button the bow or arch of a staple made from sheet-tin, the prongs of which are passed through the board and clinched down directly on the non metallic backing. In packing, handling, and using the boards the solder is apt to give way and the button be detached; or the clinched prongs may straighten or draw out, being bent 'down on asoft material, which precludes making a sharp bend in clinching. I pass the prongs of the staple b down through slits in the button and through the board, then through slits in a metal plate or washer, c, and then clinch them down on the said plate or washer c. This mode of attachment insures the butwitnesses.

other ductile metals capable of being spun as copper or brass, for example.

Having thus described my invention, I claim- 1. A stove-board comprising a base or backing of wood or other suitable material, a facing of tin-plate or its specified equivalent, and a border of sheetzinc or other ductile metal, seamed to the margin of the tin-plate and spun down over the edge of the backing, substantially as and for the purposes set forth.

2. A metal covering for the wooden backing of a stove-board, composed of a sheet of hard refractory metalas tin-plate, for example to form the facing of the board, and a border of sheet-zinc, or other ductile metal capable of being formed over the edge of the wood by spinning, seamed to the exterior margin of the tin plate, substantially as and for the purposes set forth.

3. The combination, with a stove-board, of the button a, the staple b, secured to or in the button a, and the metallic washerplate 0, upon which the prongs of the staple are clinched, all substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing A. IRVING GRIGGS. "XVitnesses:

ARTHUR O. FRASER,

HENRY CoNNETT. 

